Measuring K${}_{\mathrm{S}}^0$K${}^{\pm }$ interactions using Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

Abstract

We present the first ever measurements of femtoscopic correlations between the K${}_{\mathrm{S}}^0$ and K${}^{\pm }$ particles. The analysis was performed on the data from Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the $a_0(980)$ resonance. The extracted kaon source radius and correlation strength parameters for K${}_{\mathrm{S}}^0$K${}^{-}$ are found to be equal within the experimental uncertainties to those for K${}_{\mathrm{S}}^0$K${}^{+}$. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the $a_0$ resonance are constrained. Our results are also compatible with the interpretation of the $a_0$ having a tetraquark structure over that of a diquark.

arXiv comment21 pages, 5 captioned figures, 3 tables, authors from page 16, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3588

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